I initiated the cryotarget cooldown process. Talked to cryogroup (Robert Norton)> He initially told me they need to do a calibration of valve(s) (for magnets). Then informed me that we can start cooldown. After we the return line pre-cooled, I started open J-T valve. Then Cryogroup (Pete Knudson) informed us there are some instability in ESR due to the Hall A magnets. We had to stop. I closed J-T valve. Talking to Pete Knudson, we left the other steps as they were and will resume after ESr stabilize (probably around mid-afternoon. Plan is still try to complete target cool-down today.